soundmodem.ini is located ... in Windows10: Satellites information update by JE9PEL

C:/Users -> AppData -> Local -> VirtualStore
         -> Program Files -> (soundmodem105) -> soundmodem.ini

And, 

Right click on the folder -> Properties -> Security -> Users
  -> Edit to change permissions -> Users -> Check "Full control"

Then, this ini_file is saved in this own folder.